Cal. Food & Agric. Code § 12883
Except as otherwise provided in Section 12884 , a pesticide is also misbranded when the label fails to state one of the following:
(b) The name of each active ingredient, together with the name of each and the total percentage of the inert ingredients, if there are any, in the pesticide.
A pesticide that is sold only as a spray adjuvant is not misbranded if the total percentage of the constituents ineffective as a spray adjuvant is stated on the label without mention of the terms “active ingredient” or “inert ingredient” in lieu of one of the options required by this section.